Editing the Kubick Style Sheet

I’ve used the basic Kubrick theme to make my own thing. I’ve changed all the graphics and some of the font colors and styles, and I’m very pleased with the results, but when I click the “Presentation” tab ievery instance of the word Kubrick is replaced by the entire body of the css document. This isn’t causing a problem on the frontend, but I don’t like that it’s happening and I can’t figure out how to fix it! All I’ve changed in the css are some colors and fonts. Why is this happening? Do I need to edit it from within WordPress? (I’ve been using dreamweaver.)